[PATCH] fix memory corruption issues in grub_vbe_bios_getset_dac_palette()

[Robert Millan]

These were spotted by Colin Watson.  Unfortunately, users report that it
doesn't fix the problem for them.  But the fix almost certainly looks good,
so I'm inclined to commit it.

I'd appreciate if more people can review this code (my proposed changes and
the function as a whole).  I can't see any other vector that could introduce
corruption, other than the VBE interrupt routine itself.

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

grub_vbe_bios_getset_dac_palette.diff
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